working on subscription

src/main/java/de/srsoftware/widerhall/data/ListMember.java

@@ -15,6 +15,7 @@ public class ListMember {
     private static final Logger LOG = LoggerFactory.getLogger(ListMember.class);
     public static final String TABLE_NAME = "ListMembers";
     public static final int STATE_OWNER = 1;
+    public static final int STATE_SUBSCRIBER = 2;
     private static final String LIST_EMAIL = "list_email";
     private static final String USER_EMAIL = "user_email";
     private static final String STATE = "state";

src/main/java/de/srsoftware/widerhall/data/User.java

@@ -9,6 +9,7 @@ import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.time.LocalDate;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -28,8 +29,12 @@ public class User {
     }
 
     public static User create(String email, String name, String password) throws SQLException {
-        var salt = Util.sha256(email + name + LocalDate.now());
-        var hashedPass = Util.sha256(password+salt);
+        String salt = null;
+        String hashedPass = null;
+        if (password != null) {
+            salt = Util.sha256(email + name + LocalDate.now());
+            hashedPass = Util.sha256(password + salt);
+        }
         return new User(email,name,salt,hashedPass).save();
     }
 
@@ -102,6 +107,7 @@ public class User {
 
 
     private boolean matching(String password) {
+        if (hashedPass == null && password == null) return true;
         return hashedPass.equals(Util.sha256(password+salt));
     }
 
@@ -126,8 +132,13 @@ public class User {
     }
 
     private User save() throws SQLException {
+        var values = new HashMap<String,Object>();
+        values.put(EMAIL,email);
+        values.put(NAME,name);
+        if (salt != null) values.put(SALT,salt);
+        if (hashedPass != null) values.put(HASHED_PASS,hashedPass);
         Database.open().insertInto(TABLE_NAME)
-                .values(Map.of(EMAIL,email,NAME,name,SALT,salt,HASHED_PASS,hashedPass))
+                .values(values)
                 .run();
         return this;
     }

src/main/java/de/srsoftware/widerhall/web/Web.java

@@ -17,6 +17,7 @@ import javax.servlet.http.HttpServletResponse;
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
+import java.security.InvalidKeyException;
 import java.sql.SQLException;
 import java.util.HashMap;
 import java.util.Map;
@@ -40,6 +41,7 @@ public class Web extends HttpServlet {
     private static final String SMTP_PORT = "smtp_port";
     private static final String SMTP_USER = "smtp_user";
     private static final String SMTP_PASS = "smtp_pass";
+    private static final int PRIMARY_KEY_CONSTRAINT = 19;
     private final String baseDir;
     private STGroup templates;
     private static final String WEB_ROOT = "/web";
@@ -312,7 +314,6 @@ public class Web extends HttpServlet {
         var data = new HashMap<String,String>();
         data.put(NAME,name);
         data.put(EMAIL,email);
-        data.put(PASSWORD,pass);
         data.put(LIST,list);
         if (list == null || list.isBlank()){
             data.put(ERROR,"No list provided by form data!");
@@ -323,6 +324,39 @@ public class Web extends HttpServlet {
             data.put(ERROR,"Name and email are required fields for list subscription!");
             return loadTemplate(SUBSCRIBE,data,resp);
         }
-        return "not implemented";
+        if (pass != null && pass.isBlank()) pass = null;
+
+        try {
+            User.create(email,name,pass);
+        } catch (SQLException sqle) {
+            var cause = getCausingException(sqle);
+            int code = cause.getErrorCode();
+            if (code == PRIMARY_KEY_CONSTRAINT) try {// user already exists
+                User.load(email,pass);
+                // success → subscribe
+            } catch (InvalidKeyException | SQLException e) {
+                // invalid credentials
+                data.put(ERROR,t("'{}' already in database, but with different password!",email));
+                return loadTemplate(SUBSCRIBE,data,resp);
+            }
+        }
+        try {
+            ListMember.create(list,email,ListMember.STATE_SUBSCRIBER);
+            data.put(NOTES,t("Successfully subscribed '{}' to '{}'.",email,list));
+            return loadTemplate(INDEX,data,resp);
+        } catch (SQLException e) {
+            LOG.debug("List subscription failed: ",e);
+            data.put(ERROR,t("Subscription failed: {}",e.getMessage()));
+            return loadTemplate(SUBSCRIBE,data,resp);
+        }
+    }
+
+    private SQLException getCausingException(SQLException sqle) {
+        Throwable cause = sqle.getCause();
+        while (cause instanceof SQLException){
+            sqle = (SQLException) cause;
+            cause = sqle.getCause();
+        }
+        return sqle;
     }
 }

static/templates/index.st

@@ -11,7 +11,6 @@
         «userinfo()»
         «messages()»
         <h1>Widerhall Index page</h1>
-        «messages()»
         «listlist()»
     </body>
 </html>

static/templates/js.st

@@ -43,9 +43,13 @@ function showListAdminList(data){
         let list = data.lists[i];
         let row = $('<tr/>');
         let addr = list.email.prefix+'@'+list.email.domain;
-
-        $('<td/>').text(list.name).appendTo(row);
-        $('<td/>').text(addr).appendTo(row);
+        let inspect = 'inspect?list='+addr;
+        let td = $('<td/>');
+        $('<a/>',{href:inspect}).text(list.name).appendTo(td);
+        td.appendTo(row);
+        td = $('<td/>');
+        $('<a/>',{href:inspect}).text(addr).appendTo(td)
+        td.appendTo(row);
         $('<td/>').text(list.state).appendTo(row);
 
         let select = $('<select/>',{name:addr}).change(function () {